Add a command line flag for dumping trace events to VLOG

cc/test/cc_test_suite.cc

Index: cc/test/cc_test_suite.cc
diff --git a/cc/test/cc_test_suite.cc b/cc/test/cc_test_suite.cc
index 19d478eb59ec0a55d213d30311ca5b5c6e4f9595..d4d15d3e42d423f87e21bc3251987ebadc4be959 100644
--- a/cc/test/cc_test_suite.cc
+++ b/cc/test/cc_test_suite.cc
@@ -4,7 +4,13 @@
 
 #include "cc/test/cc_test_suite.h"
 
+#include <string>
+
+#include "base/command_line.h"
+#include "base/debug/trace_event_impl.h"
 #include "base/message_loop.h"
+#include "base/threading/thread_id_name_manager.h"
+#include "cc/base/switches.h"
 #include "cc/test/paths.h"
 
 namespace cc {
@@ -17,7 +23,26 @@ CCTestSuite::~CCTestSuite() {}
 void CCTestSuite::Initialize() {
   base::TestSuite::Initialize();
   RegisterPathProvider();
+
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+        switches::kCCUnittestsTraceEventsToVLOG)) {
+    std::string category_string =
+        CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+            switches::kCCUnittestsTraceEventsToVLOG);
+
+    if (!category_string.size())
+      category_string = "cc";
+
+    base::debug::TraceLog::GetInstance()->SetEnabled(
+        base::debug::CategoryFilter(category_string),
+        base::debug::TraceLog::ECHO_TO_VLOG);
+  }
+
   message_loop_.reset(new base::MessageLoop);
+
+  base::ThreadIdNameManager::GetInstance()->SetName(
+      base::PlatformThread::CurrentId(),
+      "Main");
 }
 
 void CCTestSuite::Shutdown() {